Submission #227103

#	Time	Username	Problem	Language	Result	Execution time	Memory
227103		Uzumaki_Naturoo	Commuter Pass (JOI18_commuter_pass)	C++17	15 / 100	402 ms	18648 KiB

commuter_pass

/// You just can't beat the person who never gives up
/// ICPC next year

#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include<bits/stdc++.h>
using namespace std ;
const int N = 1e5+5 ;

int n ,m ,s ,t ,u ,v ,a ,b ,c ;
vector<pair<int,int>> adj[N] ;
long long dis[3][N] ;
void dijkstra(int src,long long d[]){
    for(int i=0;i<N;++i) d[i] = 1e18 ;
    d[src] = 0 ;
    priority_queue<pair<long long,int>> pq ;
    pq.push({0,src});
    while(pq.size()){
        int p = pq.top().second ;
        pq.pop() ;
        for(auto e:adj[p]){
            int ch = e.first ;
            int cst = e.second ;
            if(d[ch]<=d[p]+cst) continue ;
            d[ch] = d[p]+cst ;
            pq.push({-d[ch],ch});
        }
    }
}
long long mem[N] ;
long long dfs(int p,long long a,long long b){
    long long&ret = mem[p];
    if(~ret) return ret ;
    ret = a + b ;
    for(auto e:adj[p]){
        int ch = e.first ;
        int cst = e.second ;
        if(dis[0][ch]!=dis[0][p]-cst) continue ;
        long long aa = min(a ,dis[1][ch]) ;
        long long bb = min(b ,dis[2][ch]) ;
        ret = min(ret ,dfs(ch,aa,bb)) ;
    }
    return ret ;
}
int main(){
    scanf("%d%d%d%d%d%d",&n,&m,&s,&t,&u,&v);
    while(m--){
        scanf("%d%d%d",&a,&b,&c);
        adj[a].push_back({b,c});
        adj[b].push_back({a,c});
    }
    dijkstra(s,dis[0]) ;
    dijkstra(u,dis[1]) ;
    dijkstra(v,dis[2]) ;
    memset(mem,-1,sizeof mem);
    printf("%lld",min(dfs(t,dis[1][t],dis[2][t]) ,dis[1][v])) ;
    return 0;
}

Compilation message (stderr)

commuter_pass.cpp: In function 'int main()':
commuter_pass.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d%d%d%d",&n,&m,&s,&t,&u,&v);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:49:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d",&a,&b,&c);
         ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 16
• Subtask 2: 15 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45